Atmospheric dispersion compensation for ELTs

Details Atmospheric dispersion compensation for ELTs Atmospheric dispersion compensation for ELTs

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.6986e..17a&link_type=abstract

Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg. Edited by Andersen, Torben E. Proceed

Computer Science

Scientific paper

This paper summarises the problems related to atmospheric dispersion (AD), both active (angular dispersion due to change in the telescope zenith angles) and adaptive (the atmospheric turbulence depends on wavelength since the refractive index and r0 are also wavelength dependent). We compare the AO effects and its compensation by deformable mirrors (achromatic by definition and incapable of compensating the atmospheric dispersion) using GLAO and LTAO with those of the atmospheric dispersion. We present preliminary optical designs for ADCs in Euro50 and E-ELT to compensate the zenith dependence dispersion of the atmosphere.

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